Casehardening material



Patented Dec. 22, 1925.

ononen oo'LnMAN NIXON, or SYRACUSE, NEW YORK.

CASEHABDENING MATERIAL.

No Drawing.

To all whom it may concern:

Be it known that I, GEORGE C LEMAN NIXON, a citizen of the United States, and a resident of Syracuse, county of ()nondaga,

and State of New York, have invented a certain new and useful Casehardening Material; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being bad to the accompanying drawings, in which like numerals refer to like parts.

This invention relates to an improved compound or material for use in casehardening iron or steel. Heretofore casehardening material has been made by adding to a suit able carbonaceous material, such as charcoal, coke, and the like, an energizer, such as soda ash, lime, barium carbonate and the like.

What I claim as new and an improvement in the art is the use of an alkali metal phosphate, such as sodium phosphate or potassium phosphate, as an energizer in such compounds, either singly or in conjunction with carbonates. By phosphate I mean either mono-phosphate or multi-phosphate, such as di or tri-phosphatc, all of which have a similar action.

One method of making the compound is to soak the carbonaceous materials, such as charcoal, coke, and the like, in a solution I of alkali metal phosphate, such as sodium or potassium phosphate, until thoroughly saturated and then dry to make the finished casehardening compound. One to ten percent, by weight, of said phosphate is desirable, although I do not limit myself to these proportions.

This casehardening material is peculiarly well adapted for use in the dry packing process of casehardening and it will produce a deeper and an apparently harder case than similar compounds using sodaash, lime, barium carbonate and other old kind of energizer. Sodium or potassium phosphate has never been known as an energizer, nor does it make carbon monoxide like the compound of carbonaceous material and soda ash and like old energizers. But how or why the phosphate energizes the carbonaceous material for casehardening purposes, is not fully Application filed October 20, 1923. Serial No. 669,736.

7 known, nor what gas does result from said compound.

It isknown, however, from careful and thorough tests, that it makes a thicker and a harder case than a. similar quantity of casehardening material heretofore known in the art and with similar use. The increase in the thickness of the case and in the hardness,

of the case is of very great importance in meant any chemical which is capableof rendering the carbonaceous material more active and effective in case hardening iron or steel, such as barium carbonate, sodaash, lime, or other old energizers', as well as the new energizer herein set forth. By alkali metal phosphate herein is meant sodium or potassium phosphate, whether monoor multi-phosphates.

The invention claimed is:

1. Casehardening material including carbonaceousmaterial, and an alkali metal phosphate mixed therewith.

2. Casehardening material including carbonaceous material, and sodium phosphate mixed therewith.

' 3. Casehardening material including carbonaceous material, and from one to ten percent of an alkali metal phosphate mixed therewith. V

4. Casehardening material including carbonaceous material, and from one to ten per cent of sodium phosphate mixed therewith.

5. Casehardening material including carbonaceous material, and a multi-alkali metal phosphate mixed therewith.

6. Casehardening materialincluding carbonaceous materialQand tri-sodinm phosphate mixed therewith.

7. Casehardening material including carbonaceous material, and from one to ten percent of a multi-alkali metal phosphate mixed therewith.

8. Casehardening material including car- 5 bonaceous material, and from one to ten percent of tri-sodium phosphate mixed there- V r L' r 9. Gasehardening material includingcarbonaceous material impregnated with an alkali metal phosphate.

10. Casehardening material including car bonaceo'us material impregnated 'With a multi-alkali metal phosphate.

11. Casehardening material including carbonaceous material impregnated With trisodium phosphate.

In Witness whereof, I hate hereunto I affixed my signature. 7

GEORGE COLEMAN NIXON. 

